-LRB- CNN -RRB- -- Those who were in AC Milan 's San Siro stadium Saturday night for the Italian club 's Serie A clash with Fiorentina say the atmosphere felt like a long `` good bye . ''

Kaka waves to supporters during Milan 's match with Fiorentina on Saturday .

As Kaka entered the pitch he took a long look around and then beat his fist on his chest -- a gesture commonly used by footballers to display their loyalty to supporters . Was he saying Milan will always be in his heart ? Or was he simply giving everyone a heartfelt `` saludo '' ?

Kaka , Milan 's Brazilian superstar and a former world footballer of the year , is reported to be the subject of a $ 150 million bid from super-rich English club Manchester City that would smash football 's transfer word record .

Milan 's supporters are on Kaka 's side , because they believe it is club officials who want to sell him . Silvio Berlusconi , no longer the club 's president but the man in charge when it comes to make major decisions , said this week that it was difficult to ask someone who earns 10 million euros a year to turn down an offer of 15 million euros , adding `` It 's a difficult offer to refuse . ''

Berlusconi is counting his own money . Italy 's prime minister is also the country 's richest man and he remains businessman at heart . He purchased Kaka in 2003 for $ 7.5 million -LRB- roughly 8 million euros at the time -RRB- . Selling him on would generate a massive profit on his investment -- in cash and paid up front .

Privately , most Milan supporters would probably agree with Berlusconi 's reasoning . After all , when so much money is at stake , your head as much as your heart must decide , and the ball at this point is with Kaka rather than club officials .

Still supporters displayed a mix of anger and sarcasm on Saturday evening . `` Hands off Kaka '' read one banner , while another said : `` I thought the devil could not sell its soul , but I was wrong , '' referring to Milan 's devil 's head logo .

`` Berlusconi , Interista '' read another one , referring to Inter , the city 's other top team and AC Milan 's archrivals .

In a choreographed protest 30 minutes into Saturday 's match , hundreds of supporters occupying a section of the central stand waved 50-euro notes towards AC Milan President Adriano Galliani , sitting just above them .

Galliani did n't react , but perhaps thought to himself that the money was n't even enough to pay Kaka 's wages for a day .

The 26-year-old will reportedly earn around $ 500,000 a week at Manchester City . Likewise , the 5,000 supporters who signed a petition to keep the Brazilian star in Milan would have to pay $ 100 a week each to match the offer .

A single banner criticized the player . `` I belong to money '' it read , referring to the `` I belong to Jesus '' t-shirt Kaka has displayed occasionally after scoring a goal . The banner stayed up only a few minutes but then mysteriously disappeared . Even on this emotional evening at the San Siro there was no room for criticism of the fans ' Brazilian hero .

At the end of the game Kaka 's teammates hugged him and he waved again towards the supporters . Was he saying goodbye to them -- or to a $ 150 million move to Manchester ?

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Milan fans express anger over Kaka 's rumored $ 150M move to Manchester City

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Fans wave banknotes at club officials , display `` Hands off Kaka '' banners

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Brazilian waved to fans , beat chest with fist , at start and end of match

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Milan have admitted 26-year-old could leave club in a world record deal